The ESP-12 is a self contained 802.11 b/g/n Wi-Fi enabled microcontroller featuring the ESP8266 SOC. Pin for pin compatible with other boards in the ESP-12x range with stability and wireless capability. It has 4Mbyte flash memory and software updates can be rolled out to it over-the-air. Use it as a cheap and easy way to add Wi-Fi connectivity to your Arduino / Raspberry Pi etc. or use it as a powerful standalone Wi-Fi enabled MCU in its own right

The ESP8266 Wi-Fi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your Wi-Fi network.